Incandescent electric bulb



6 1927. Sept F. L. WEISS INCANDESQENT ELECTRIC BULB Filed Feb. 23, 1926 A ORNE Y Patented Sept. 6, 1927.

UNITED STATES FRANK L. WEISS, 0] BRONX, NEW

INCANDESGENT ELECTRIC BULB.

Application filed February 2a, 1926. Serial No. 90,023.

This invention relates to incandescent electriclamphandhas for an object'to provide a lamp aving a plurality of filaments so as to be capable of use for various degrees of illumination. 4

Another object is to. provide a lamp having a plurality of chemically treated filaments so as to be capable of use for illuminating in various colors. I

A further object of this invention resides in the novel arrangement and construction thereof, and for further comprehension of the invention, and of the b ectS and advantages thereof, reference Will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features are more particularly set forth.

Fig. 1 of the drawing shows a perspective view of a lamp embod 'ng this invention.

Fig. 2 shows a top e evational view of the lamp shown in Fig. 1.

Fig. 3 indicates the tacts in the socket in w be inserted, the external-wiring tacts, and the relation of the to the socket contacts.

Fi 4 shows a fragmentar vertical sectiona view of a slightly mo ified form, in which the in for fastening lamp in socket are adjusta 1e. i

Fig. 5 shows a horizontal sectional view taken on the line 5-5 of Fig. 4. I

Fi 6 shows a fra entary vertical section view taken on t e line 6-6 of Fig. 5.

The lamp shown on the drawing 1S constructedwith a plug portion 10, and a bulb portion 11, the plug portion being provided with three contacts 12, 13 and 14 at its upper end, and on its sides with pro ecting pins 15, and 16, wh ch are for engagement with bayonet slots in a suitable socket in which the lamp is adapted to be inserted. Within the bulb portion 11, a central post 17 of glass, or other suitable insulatm material extends from the socket portion ownosition of the conliich the lamp is to to these conamp contacts 'wards, and at its lower extremity supports a luralit of arms 18, preferably at right angles to the said post 17. lead 19'e xtends from the contact 12, thru the post 17, emerging from the bottom thereof, and is suitably connected as at 20 to a filament 21 supported by'the arms 18, and terminating at 22. A lead 23 extends from the contact 13 thru the top portion of post "17, and thereafter projects outwards, and suitably conshown,

nects as at 22 to a filament 25, which is electrically connected at 22 -to filament-21, and this filament 25 terminates at 24, where it is electrically connected to lead 26 from the contact 14.

With this structure various degrees of illumination maybe obtained. For exam 1e, filament 21 may be a twenty-five watt lament, and '25 maybe a fifty watt filament. With this arran ement three degrees of illumination is possible, viz, if the lamp plug is connected in the socket so that the current acts between contacts 12, and 13, the twentyfive watt filament will be illuminated acting between 13, and 14, the fifty watt filament will be illuminated, and acting between 12, I

and 14, both the twenty-five and fifty watt filaments will be illuminated, bein equivalent to a watt filament. It wil readily be seen that the filaments may be arranged to give desired degrees of illumination. Furthermore filaments giving out colored rays may be used, so that the lamp may be used to illuminate in various colors.

It may be of interest to consider the necessary arrangement of the contacts in the lamp socket, which receives the lam to permit of the various connections. Re erring to Fig. 3, the line 27 and 28 leads to the sockets,

which connect to two contacts 29, and 30.

The contacts are arranged on a circle of the same diameter as used for the contacts 12,

13, and 14 of the lamp plug, and should be spaced 120 arc apart. As shown in Fig. 3, contacts 29 and 14 connect, simultaneously with 30, and 12. The sockets are arranged with three sets of bayonet slots to accommodate ins 15, and 16, at eve? one-third turn. The amp may be removed rom the position iven a one-third turn to the right and rep aced, then 13 will connect with 29, and 14 with 30. Another one-third turn will result in 12 connecting with 29, and 13 with 30. The modification shown in Figs. 4, 5, and 6, shows the pins 15, and 16, radially and vertically adjustable. A ring 31 is fixed in the plug, has screw 32 with heads exterior to the plug, engaged in slots 33 of supports 34, and nuts 35 on the bottom thereof. The supports carry the pins which are engaged in vertical slots 36, and are provided with lock screws 37 and nuts 38.

While I have illustrated and described my invention with some degree of particularity, I realize that in practice various alterations therein may be made. I therefore reserve combination of a ring fixed to said plug per-- tion, screws passing through said plug. portion and ring,said'screws having heads exterior to the plug, supports formed with slots, the bottoms of said screws passing through said slots, nuts on the bottom of izo said screws, said supports being also formed with vertical slots, pins engageable in said vertical slots, and lock screws and nuts engageable with said pins and said supports, said pins projecting through the side openings of said plug.

2. In a device of the class described, having a plug portion, the combination of a ring.

fixed to said plug portion, screws passing through said plug portion and, ring, said screws having heads exteriorv to the plug,

sup orts formed with slots, the bottoms of screws and nuts engageable with said pins and said supports.

3. In a device of the class described, having a plug portion with. side openings, the combination of a ring fixed to said plug portion, screws passing through said plug ortion and ring, sup orts formed with s ots, the bottoms of sai screws passin through said slots, nuts on the bottom of said screws, said supports being also formed with vertical slots, pins engageable in said vertical slots, and lock screws and nuts engageable with said pins and said supports, said pins I projecting through the side openings of said plug.

In testimony whereof I have aflixed my signature.

FRANK L. WEISS. 

